titles, translations fix, more string to translation

_config.yml

_i18n/en.yml

_layouts/default.html

_nodeop/clive.md

_nodeop/drone.md

_nodeop/exchange-node.md

_nodeop/get-transaction-node.md

_nodeop/haf-api.md

_nodeop/index.md

_nodeop/jussi-multiplexer.md

_nodeop/monit.md

_nodeop/node-cli.md

_nodeop/node-config.md

_nodeop/plugin-and-api-list.md

_nodeop/seed-node.md

_nodeop/setting-up-a-testnet.md

_nodeop/using-hivemind.md

_services/jussi.md

_testnet/tools.md

_tutorials/index.md